RISC-V ISA Explorer · Atomics (Za/Zic*)

Zawrs: Wait-on-Reservation-Set

Ratified 2022-11 · version 1.0.0

Lets a hart idle in a low-power state while polling a memory location for another agent's update.

Typical use: Low-power waiting on LR/SC reservations

Specification

Open Zawrs in the explorer

Instructions (2)

MnemonicNameEncodingMatchMask
WRS.NTOWait-on-Reservation-Set-with-No-Timeout000000001101000000000000011100110xd000730xffffffff
WRS.STOWait-on-Reservation-Set-with-Short-Timeout000000011101000000000000011100110x1d000730xffffffff